(function($) { // Hide scope, no $ conflict

    var pluginName = 'countdown';

    var Y = 0; // Years
    var O = 1; // Months
    var W = 2; // Weeks
    var D = 3; // Days
    var H = 4; // Hours
    var M = 5; // Minutes
    var S = 6; // Seconds

    /** Create the countdown plugin.
    	<p>Sets an element to show the time remaining until a given instant.</p>
    	<p>Expects HTML like:</p>
    	<pre>&lt;div>&lt;/div></pre>
    	<p>Provide inline configuration like:</p>
    	<pre>&lt;div data-countdown="name: 'value'">&lt;/div></pre>
     	@module Countdown
    	@augments JQPlugin
    	@example $(selector).countdown({until: +300}) */
    $.JQPlugin.createPlugin({

        /** The name of the plugin. */
        name: pluginName,

        /** Countdown expiry callback.
        	Triggered when the countdown expires.
        	@callback expiryCallback */

        /** Countdown server synchronisation callback.
        	Triggered when the countdown is initialised.
        	@callback serverSyncCallback
        	@return {Date} The current date/time on the server as expressed in the local timezone. */

        /** Countdown tick callback.
        	Triggered on every <code>tickInterval</code> ticks of the countdown.
        	@callback tickCallback
        	@param periods {number[]} The breakdown by period (years, months, weeks, days,
        			hours, minutes, seconds) of the time remaining/passed. */

        /** Countdown which labels callback.
        	Triggered when the countdown is being display to determine which set of labels
        	(<code>labels</code>, <code>labels1</code>, ...) are to be used for the current period value.
        	@callback whichLabelsCallback
        	@param num {number} The current period value.
        	@return {number} The suffix for the label set to use. */

        /** Default settings for the plugin.
			@property until {Date|number|string} The date/time to count down to, or number of seconds
						offset from now, or string of amounts and units for offset(s) from now:
						'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
			@example until: new Date(2013, 12-1, 25, 13, 30)
 until: +300
 until: '+1O -2D'
			@property [since] {Date|number|string} The date/time to count up from, or
						number of seconds offset from now, or string for unit offset(s):
						'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
			@example since: new Date(2013, 1-1, 1)
 since: -300
 since: '-1O +2D'
			@property [timezone=null] {number} The timezone (hours or minutes from GMT) for the target times,
						or null for client local timezone.
			@example timezone: +10
 timezone: -60
			@property [serverSync=null] {serverSyncCallback} A function to retrieve the current server time
						for synchronisation.
			@property [format='dHMS'] {string} The format for display - upper case for always, lower case only if non-zero,
						'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds.
			@property [layout=''] {string} Build your own layout for the countdown.
			@example layout: '{d<}{dn} {dl}{d>} {hnn}:{mnn}:{snn}'
			@property [compact=false] {boolean} True to display in a compact format, false for an expanded one.
			@property [padZeroes=false] {boolean} True to add leading zeroes
			@property [significant=0] {number} The number of periods with non-zero values to show, zero for all.
			@property [description=''] {string} The description displayed for the countdown.
			@property [expiryUrl=''] {string} A URL to load upon expiry, replacing the current page.
			@property [expiryText=''] {string} Text to display upon expiry, replacing the countdown. This may be HTML.
			@property [alwaysExpire=false] {boolean} True to trigger <code>onExpiry</code> even if target time has passed.
			@property [onExpiry=null] {expiryCallback} Callback when the countdown expires -
						receives no parameters and <code>this</code> is the containing division.
			@example onExpiry: function() {
	...
 }
			@property [onTick=null] {tickCallback} Callback when the countdown is updated -
						receives <code>number[7]</code> being the breakdown by period
						(years, months, weeks, days, hours, minutes, seconds - based on
						<code>format</code>) and <code>this</code> is the containing division.
			@example onTick: function(periods) {
 	var secs = $.countdown.periodsToSeconds(periods);
 	if (secs < 300) { // Last five minutes
		...
 	}
 }
			@property [tickInterval=1] {number} The interval (seconds) between <code>onTick</code> callbacks. */
        defaultOptions: {
            until: null,
            since: null,
            timezone: null,
            serverSync: null,
            format: 'YdH',
            layout: '',
            compact: false,
            padZeroes: false,
            significant: 0,
            description: '',
            expiryUrl: '',
            expiryText: '',
            alwaysExpire: false,
            onExpiry: null,
            onTick: null,
            tickInterval: 1
        },

        /** Localisations for the plugin.
			Entries are objects indexed by the language code ('' being the default US/English).
			Each object has the following attributes.
			@property [labels=['Years','Months','Weeks','Days','Hours','Minutes','Seconds']] {string[]}
						The display texts for the counter periods.
			@property [labels1=['Year','Month','Week','Day','Hour','Minute','Second']] {string[]}
						The display texts for the counter periods if they have a value of 1.
						Add other <code>labels<em>n</em></code> attributes as necessary to
						cater for other numeric idiosyncrasies of the localisation.
			@property [compactLabels=['y','m','w','d']] {string[]} The compact texts for the counter periods.
			@property [whichLabels=null] {whichLabelsCallback} A function to determine which
						<code>labels<em>n</em></code> to use.
			@example whichLabels: function(num) {
	return (num > 1 ? 0 : 1);
 }
			@property [digits=['0','1',...,'9']] {number[]} The digits to display (0-9).
			@property [timeSeparator=':'] {string} Separator for time periods in the compact layout.
			@property [isRTL=false] {boolean} True for right-to-left languages, false for left-to-right. */
        regionalOptions: { // Available regional settings, indexed by language/country code
            '': { // Default regional settings - English/US
                labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],
                labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],
                compactLabels: ['y', 'm', 'w', 'd'],
                whichLabels: null,
                digits: ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'],
                timeSeparator: ':',
                isRTL: false
            }
        },

        /** Names of getter methods - those that can't be chained. */
        _getters: ['getTimes'],

        /* Class name for the right-to-left marker. */
        _rtlClass: pluginName + '-rtl',
        /* Class name for the countdown section marker. */
        _sectionClass: pluginName + '-section',
        /* Class name for the period amount marker. */
        _amountClass: pluginName + '-amount',
        /* Class name for the period name marker. */
        _periodClass: pluginName + '-period',
        /* Class name for the countdown row marker. */
        _rowClass: pluginName + '-row',
        /* Class name for the holding countdown marker. */
        _holdingClass: pluginName + '-holding',
        /* Class name for the showing countdown marker. */
        _showClass: pluginName + '-show',
        /* Class name for the description marker. */
        _descrClass: pluginName + '-descr',

        /* List of currently active countdown elements. */
        _timerElems: [],

        /** Additional setup for the countdown.
        	Apply default localisations.
        	Create the timer. */
        _init: function() {
            var self = this;
            this._super();
            this._serverSyncs = [];
            var now = (typeof Date.now == 'function' ? Date.now :
                function() {
                    return new Date().getTime();
                });
            var perfAvail = (window.performance && typeof window.performance.now == 'function');
            // Shared timer for all countdowns
            function timerCallBack(timestamp) {
                var drawStart = (timestamp < 1e12 ? // New HTML5 high resolution timer
                    (perfAvail ? (performance.now() + performance.timing.navigationStart) : now()) :
                    // Integer milliseconds since unix epoch
                    timestamp || now());
                if (drawStart - animationStartTime >= 1000) {
                    self._updateElems();
                    animationStartTime = drawStart;
                }
                requestAnimationFrame(timerCallBack);
            }
            var requestAnimationFrame = window.requestAnimationFrame ||
                window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame ||
                window.oRequestAnimationFrame || window.msRequestAnimationFrame || null;
            // This is when we expect a fall-back to setInterval as it's much more fluid
            var animationStartTime = 0;
            if (!requestAnimationFrame || $.noRequestAnimationFrame) {
                $.noRequestAnimationFrame = null;
                setInterval(function() {
                    self._updateElems();
                }, 980); // Fall back to good old setInterval
            } else {
                animationStartTime = window.animationStartTime ||
                    window.webkitAnimationStartTime || window.mozAnimationStartTime ||
                    window.oAnimationStartTime || window.msAnimationStartTime || now();
                requestAnimationFrame(timerCallBack);
            }
        },

        /** Convert a date/time to UTC.
			@param tz {number} The hour or minute offset from GMT, e.g. +9, -360.
			@param year {Date|number} the date/time in that timezone or the year in that timezone.
			@param [month] {number} The month (0 - 11) (omit if <code>year</code> is a <code>Date</code>).
			@param [day] {number} The day (omit if <code>year</code> is a <code>Date</code>).
			@param [hours] {number} The hour (omit if <code>year</code> is a <code>Date</code>).
			@param [mins] {number} The minute (omit if <code>year</code> is a <code>Date</code>).
			@param [secs] {number} The second (omit if <code>year</code> is a <code>Date</code>).
			@param [ms] {number} The millisecond (omit if <code>year</code> is a <code>Date</code>).
			@return {Date} The equivalent UTC date/time.
			@example $.countdown.UTCDate(+10, 2013, 12-1, 25, 12, 0)
 $.countdown.UTCDate(-7, new Date(2013, 12-1, 25, 12, 0)) */
        UTCDate: function(tz, year, month, day, hours, mins, secs, ms) {
            if (typeof year == 'object' && year.constructor == Date) {
                ms = year.getMilliseconds();
                secs = year.getSeconds();
                mins = year.getMinutes();
                hours = year.getHours();
                day = year.getDate();
                month = year.getMonth();
                year = year.getFullYear();
            }
            var d = new Date();
            d.setUTCFullYear(year);
            d.setUTCDate(1);
            d.setUTCMonth(month || 0);
            d.setUTCDate(day || 1);
            d.setUTCHours(hours || 0);
            d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));
            d.setUTCSeconds(secs || 0);
            d.setUTCMilliseconds(ms || 0);
            return d;
        },

        /** Convert a set of periods into seconds.
	   Averaged for months and years.
			@param periods {number[]} The periods per year/month/week/day/hour/minute/second.
			@return {number} The corresponding number of seconds.
			@example var secs = $.countdown.periodsToSeconds(periods) */
        periodsToSeconds: function(periods) {
            return periods[0] * 31557600 + periods[1] * 2629800 + periods[2] * 604800 +
                periods[3] * 86400 + periods[4] * 3600 + periods[5] * 60 + periods[6];
        },

        _instSettings: function(elem, options) {
            return {
                _periods: [0, 0, 0, 0, 0, 0, 0]
            };
        },

        /** Add an element to the list of active ones.
        	@private
        	@param elem {Element} The countdown element. */
        _addElem: function(elem) {
            if (!this._hasElem(elem)) {
                this._timerElems.push(elem);
            }
        },

        /** See if an element is in the list of active ones.
        	@private
        	@param elem {Element} The countdown element.
        	@return {boolean} True if present, false if not. */
        _hasElem: function(elem) {
            return ($.inArray(elem, this._timerElems) > -1);
        },

        /** Remove an element from the list of active ones.
        	@private
        	@param elem {Element} The countdown element. */
        _removeElem: function(elem) {
            this._timerElems = $.map(this._timerElems,
                function(value) {
                    return (value == elem ? null : value);
                }); // delete entry
        },

        /** Update each active timer element.
        	@private */
        _updateElems: function() {
            for (var i = this._timerElems.length - 1; i >= 0; i--) {
                this._updateCountdown(this._timerElems[i]);
            }
        },

        _optionsChanged: function(elem, inst, options) {
            if (options.layout) {
                options.layout = options.layout.replace(/&lt;/g, '<').replace(/&gt;/g, '>');
            }
            this._resetExtraLabels(inst.options, options);
            var timezoneChanged = (inst.options.timezone != options.timezone);
            $.extend(inst.options, options);
            this._adjustSettings(elem, inst,
                options.until != null || options.since != null || timezoneChanged);
            var now = new Date();
            if ((inst._since && inst._since < now) || (inst._until && inst._until > now)) {
                this._addElem(elem[0]);
            }
            this._updateCountdown(elem, inst);
        },

        /** Redisplay the countdown with an updated display.
        	@private
        	@param elem {Element|jQuery} The containing division.
        	@param inst {object} The current settings for this instance. */
        _updateCountdown: function(elem, inst) {
            elem = elem.jquery ? elem : $(elem);
            inst = inst || elem.data(this.name);
            if (!inst) {
                return;
            }
            elem.html(this._generateHTML(inst)).toggleClass(this._rtlClass, inst.options.isRTL);
            if ($.isFunction(inst.options.onTick)) {
                var periods = inst._hold != 'lap' ? inst._periods :
                    this._calculatePeriods(inst, inst._show, inst.options.significant, new Date());
                if (inst.options.tickInterval == 1 ||
                    this.periodsToSeconds(periods) % inst.options.tickInterval == 0) {
                    inst.options.onTick.apply(elem[0], [periods]);
                }
            }
            var expired = inst._hold != 'pause' &&
                (inst._since ? inst._now.getTime() < inst._since.getTime() :
                    inst._now.getTime() >= inst._until.getTime());
            if (expired && !inst._expiring) {
                inst._expiring = true;
                if (this._hasElem(elem[0]) || inst.options.alwaysExpire) {
                    this._removeElem(elem[0]);
                    if ($.isFunction(inst.options.onExpiry)) {
                        inst.options.onExpiry.apply(elem[0], []);
                    }
                    if (inst.options.expiryText) {
                        var layout = inst.options.layout;
                        inst.options.layout = inst.options.expiryText;
                        this._updateCountdown(elem[0], inst);
                        inst.options.layout = layout;
                    }
                    if (inst.options.expiryUrl) {
                        window.location = inst.options.expiryUrl;
                    }
                }
                inst._expiring = false;
            } else if (inst._hold == 'pause') {
                this._removeElem(elem[0]);
            }
        },

        /** Reset any extra labelsn and compactLabelsn entries if changing labels.
        	@private
        	@param base {object} The options to be updated.
        	@param options {object} The new option values. */
        _resetExtraLabels: function(base, options) {
            var changingLabels = false;
            for (var n in options) {
                if (n != 'whichLabels' && n.match(/[Ll]abels/)) {
                    changingLabels = true;
                    break;
                }
            }
            if (changingLabels) {
                for (var n in base) { // Remove custom numbered labels
                    if (n.match(/[Ll]abels[02-9]|compactLabels1/)) {
                        base[n] = null;
                    }
                }
            }
        },

        /** Calculate internal settings for an instance.
        	@private
        	@param elem {jQuery} The containing division.
        	@param inst {object} The current settings for this instance.
        	@param recalc {boolean} True if until or since are set. */
        _adjustSettings: function(elem, inst, recalc) {
            var now;
            var serverOffset = 0;
            var serverEntry = null;
            for (var i = 0; i < this._serverSyncs.length; i++) {
                if (this._serverSyncs[i][0] == inst.options.serverSync) {
                    serverEntry = this._serverSyncs[i][1];
                    break;
                }
            }
            if (serverEntry != null) {
                serverOffset = (inst.options.serverSync ? serverEntry : 0);
                now = new Date();
            } else {
                var serverResult = ($.isFunction(inst.options.serverSync) ?
                    inst.options.serverSync.apply(elem[0], []) : null);
                now = new Date();
                serverOffset = (serverResult ? now.getTime() - serverResult.getTime() : 0);
                this._serverSyncs.push([inst.options.serverSync, serverOffset]);
            }
            var timezone = inst.options.timezone;
            timezone = (timezone == null ? -now.getTimezoneOffset() : timezone);
            if (recalc || (!recalc && inst._until == null && inst._since == null)) {
                inst._since = inst.options.since;
                if (inst._since != null) {
                    inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));
                    if (inst._since && serverOffset) {
                        inst._since.setMilliseconds(inst._since.getMilliseconds() + serverOffset);
                    }
                }
                inst._until = this.UTCDate(timezone, this._determineTime(inst.options.until, now));
                if (serverOffset) {
                    inst._until.setMilliseconds(inst._until.getMilliseconds() + serverOffset);
                }
            }
            inst._show = this._determineShow(inst);
        },

        /** Remove the countdown widget from a div.
        	@param elem {jQuery} The containing division.
        	@param inst {object} The current instance object. */
        _preDestroy: function(elem, inst) {
            this._removeElem(elem[0]);
            elem.empty();
        },

        /** Pause a countdown widget at the current time.
	   Stop it running but remember and display the current time.
			@param elem {Element} The containing division.
			@example $(selector).countdown('pause') */
        pause: function(elem) {
            this._hold(elem, 'pause');
        },

        /** Pause a countdown widget at the current time.
	   Stop the display but keep the countdown running.
			@param elem {Element} The containing division.
			@example $(selector).countdown('lap') */
        lap: function(elem) {
            this._hold(elem, 'lap');
        },

        /** Resume a paused countdown widget.
        	@param elem {Element} The containing division.
        	@example $(selector).countdown('resume') */
        resume: function(elem) {
            this._hold(elem, null);
        },

        /** Toggle a paused countdown widget.
        	@param elem {Element} The containing division.
        	@example $(selector).countdown('toggle') */
        toggle: function(elem) {
            var inst = $.data(elem, this.name) || {};
            this[!inst._hold ? 'pause' : 'resume'](elem);
        },

        /** Toggle a lapped countdown widget.
        	@param elem {Element} The containing division.
        	@example $(selector).countdown('toggleLap') */
        toggleLap: function(elem) {
            var inst = $.data(elem, this.name) || {};
            this[!inst._hold ? 'lap' : 'resume'](elem);
        },

        /** Pause or resume a countdown widget.
        	@private
        	@param elem {Element} The containing division.
        	@param hold {string} The new hold setting. */
        _hold: function(elem, hold) {
            var inst = $.data(elem, this.name);
            if (inst) {
                if (inst._hold == 'pause' && !hold) {
                    inst._periods = inst._savePeriods;
                    var sign = (inst._since ? '-' : '+');
                    inst[inst._since ? '_since' : '_until'] =
                        this._determineTime(sign + inst._periods[0] + 'y' +
                            sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +
                            sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' +
                            sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');
                    this._addElem(elem);
                }
                inst._hold = hold;
                inst._savePeriods = (hold == 'pause' ? inst._periods : null);
                $.data(elem, this.name, inst);
                this._updateCountdown(elem, inst);
            }
        },

        /** Return the current time periods.
        	@param elem {Element} The containing division.
        	@return {number[]} The current periods for the countdown.
        	@example var periods = $(selector).countdown('getTimes') */
        getTimes: function(elem) {
            var inst = $.data(elem, this.name);
            return (!inst ? null : (inst._hold == 'pause' ? inst._savePeriods : (!inst._hold ? inst._periods :
                this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()))));
        },

        /** A time may be specified as an exact value or a relative one.
        	@private
        	@param setting {string|number|Date} The date/time value as a relative or absolute value.
        	@param defaultTime {Date} The date/time to use if no other is supplied.
        	@return {Date} The corresponding date/time. */
        _determineTime: function(setting, defaultTime) {
            var self = this;
            var offsetNumeric = function(offset) { // e.g. +300, -2
                var time = new Date();
                time.setTime(time.getTime() + offset * 1000);
                return time;
            };
            var offsetString = function(offset) { // e.g. '+2d', '-4w', '+3h +30m'
                offset = offset.toLowerCase();
                var time = new Date();
                var year = time.getFullYear();
                var month = time.getMonth();
                var day = time.getDate();
                var hour = time.getHours();
                var minute = time.getMinutes();
                var second = time.getSeconds();
                var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;
                var matches = pattern.exec(offset);
                while (matches) {
                    switch (matches[2] || 's') {
                        case 's':
                            second += parseInt(matches[1], 10);
                            break;
                        case 'm':
                            minute += parseInt(matches[1], 10);
                            break;
                        case 'h':
                            hour += parseInt(matches[1], 10);
                            break;
                        case 'd':
                            day += parseInt(matches[1], 10);
                            break;
                        case 'w':
                            day += parseInt(matches[1], 10) * 7;
                            break;
                        case 'o':
                            month += parseInt(matches[1], 10);
                            day = Math.min(day, self._getDaysInMonth(year, month));
                            break;
                        case 'y':
                            year += parseInt(matches[1], 10);
                            day = Math.min(day, self._getDaysInMonth(year, month));
                            break;
                    }
                    matches = pattern.exec(offset);
                }
                return new Date(year, month, day, hour, minute, second, 0);
            };
            var time = (setting == null ? defaultTime :
                (typeof setting == 'string' ? offsetString(setting) :
                    (typeof setting == 'number' ? offsetNumeric(setting) : setting)));
            if (time) time.setMilliseconds(0);
            return time;
        },

        /** Determine the number of days in a month.
        	@private
        	@param year {number} The year.
        	@param month {number} The month.
        	@return {number} The days in that month. */
        _getDaysInMonth: function(year, month) {
            return 32 - new Date(year, month, 32).getDate();
        },

        /** Default implementation to determine which set of labels should be used for an amount.
        	Use the <code>labels</code> attribute with the same numeric suffix (if it exists).
        	@private
        	@param num {number} The amount to be displayed.
        	@return {number} The set of labels to be used for this amount. */
        _normalLabels: function(num) {
            return num;
        },

        /** Generate the HTML to display the countdown widget.
        	@private
        	@param inst {object} The current settings for this instance.
        	@return {string} The new HTML for the countdown display. */
        _generateHTML: function(inst) {
            var self = this;
            // Determine what to show
            inst._periods = (inst._hold ? inst._periods :
                this._calculatePeriods(inst, inst._show, inst.options.significant, new Date()));
            // Show all 'asNeeded' after first non-zero value
            var shownNonZero = false;
            var showCount = 0;
            var sigCount = inst.options.significant;
            var show = $.extend({}, inst._show);
            for (var period = Y; period <= S; period++) {
                shownNonZero |= (inst._show[period] == '?' && inst._periods[period] > 0);
                show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);
                showCount += (show[period] ? 1 : 0);
                sigCount -= (inst._periods[period] > 0 ? 1 : 0);
            }
            var showSignificant = [false, false, false, false, false, false, false];
            for (var period = S; period >= Y; period--) { // Determine significant periods
                if (inst._show[period]) {
                    if (inst._periods[period]) {
                        showSignificant[period] = true;
                    } else {
                        showSignificant[period] = sigCount > 0;
                        sigCount--;
                    }
                }
            }
            var labels = (inst.options.compact ? inst.options.compactLabels : inst.options.labels);
            var whichLabels = inst.options.whichLabels || this._normalLabels;
            var showCompact = function(period) {
                var labelsNum = inst.options['compactLabels' + whichLabels(inst._periods[period])];
                return (show[period] ? self._translateDigits(inst, inst._periods[period]) +
                    (labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');
            };
            var minDigits = (inst.options.padZeroes ? 2 : 1);
            var showFull = function(period) {
                var labelsNum = inst.options['labels' + whichLabels(inst._periods[period])];
                return ((!inst.options.significant && show[period]) ||
                    (inst.options.significant && showSignificant[period]) ?
                    '<span class="' + self._sectionClass + '">' +
                    '<span class="' + self._amountClass + '">' +
                    self._minDigits(inst, inst._periods[period], minDigits) + '</span>' +
                    '<span class="' + self._periodClass + '">' +
                    (labelsNum ? labelsNum[period] : labels[period]) + '</span></span>' : '');
            };
            return (inst.options.layout ? this._buildLayout(inst, show, inst.options.layout,
                    inst.options.compact, inst.options.significant, showSignificant) :
                ((inst.options.compact ? // Compact version
                        '<span class="' + this._rowClass + ' ' + this._amountClass +
                        (inst._hold ? ' ' + this._holdingClass : '') + '">' +
                        showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) +
                        (show[H] ? this._minDigits(inst, inst._periods[H], 2) : '') +
                        (show[M] ? (show[H] ? inst.options.timeSeparator : '') +
                            this._minDigits(inst, inst._periods[M], 2) : '') +
                        (show[S] ? (show[H] || show[M] ? inst.options.timeSeparator : '') +
                            this._minDigits(inst, inst._periods[S], 2) : '') :
                        // Full version
                        '<span class="' + this._rowClass + ' ' + this._showClass + (inst.options.significant || showCount) +
                        (inst._hold ? ' ' + this._holdingClass : '') + '">' +
                        showFull(Y) + showFull(O) + showFull(W) + showFull(D) +
                        showFull(H) + showFull(M) + showFull(S)) + '</span>' +
                    (inst.options.description ? '<span class="' + this._rowClass + ' ' + this._descrClass + '">' +
                        inst.options.description + '</span>' : '')));
        },

        /** Construct a custom layout.
        	@private
        	@param inst {object} The current settings for this instance.
        	@param show {boolean[]} Flags indicating which periods are requested.
        	@param layout {string} The customised layout.
        	@param compact {boolean} True if using compact labels.
        	@param significant {number} The number of periods with values to show, zero for all.
        	@param showSignificant {boolean[]} Other periods to show for significance.
        	@return {string} The custom HTML. */
        _buildLayout: function(inst, show, layout, compact, significant, showSignificant) {
            var labels = inst.options[compact ? 'compactLabels' : 'labels'];
            var whichLabels = inst.options.whichLabels || this._normalLabels;
            var labelFor = function(index) {
                return (inst.options[(compact ? 'compactLabels' : 'labels') +
                    whichLabels(inst._periods[index])] || labels)[index];
            };
            var digit = function(value, position) {
                return inst.options.digits[Math.floor(value / position) % 10];
            };
            var subs = {
                desc: inst.options.description,
                sep: inst.options.timeSeparator,
                yl: labelFor(Y),
                yn: this._minDigits(inst, inst._periods[Y], 1),
                ynn: this._minDigits(inst, inst._periods[Y], 2),
                ynnn: this._minDigits(inst, inst._periods[Y], 3),
                y1: digit(inst._periods[Y], 1),
                y10: digit(inst._periods[Y], 10),
                y100: digit(inst._periods[Y], 100),
                y1000: digit(inst._periods[Y], 1000),
                ol: labelFor(O),
                on: this._minDigits(inst, inst._periods[O], 1),
                onn: this._minDigits(inst, inst._periods[O], 2),
                onnn: this._minDigits(inst, inst._periods[O], 3),
                o1: digit(inst._periods[O], 1),
                o10: digit(inst._periods[O], 10),
                o100: digit(inst._periods[O], 100),
                o1000: digit(inst._periods[O], 1000),
                wl: labelFor(W),
                wn: this._minDigits(inst, inst._periods[W], 1),
                wnn: this._minDigits(inst, inst._periods[W], 2),
                wnnn: this._minDigits(inst, inst._periods[W], 3),
                w1: digit(inst._periods[W], 1),
                w10: digit(inst._periods[W], 10),
                w100: digit(inst._periods[W], 100),
                w1000: digit(inst._periods[W], 1000),
                dl: labelFor(D),
                dn: this._minDigits(inst, inst._periods[D], 1),
                dnn: this._minDigits(inst, inst._periods[D], 2),
                dnnn: this._minDigits(inst, inst._periods[D], 3),
                d1: digit(inst._periods[D], 1),
                d10: digit(inst._periods[D], 10),
                d100: digit(inst._periods[D], 100),
                d1000: digit(inst._periods[D], 1000),
                hl: labelFor(H),
                hn: this._minDigits(inst, inst._periods[H], 1),
                hnn: this._minDigits(inst, inst._periods[H], 2),
                hnnn: this._minDigits(inst, inst._periods[H], 3),
                h1: digit(inst._periods[H], 1),
                h10: digit(inst._periods[H], 10),
                h100: digit(inst._periods[H], 100),
                h1000: digit(inst._periods[H], 1000),
                ml: labelFor(M),
                mn: this._minDigits(inst, inst._periods[M], 1),
                mnn: this._minDigits(inst, inst._periods[M], 2),
                mnnn: this._minDigits(inst, inst._periods[M], 3),
                m1: digit(inst._periods[M], 1),
                m10: digit(inst._periods[M], 10),
                m100: digit(inst._periods[M], 100),
                m1000: digit(inst._periods[M], 1000),
                sl: labelFor(S),
                sn: this._minDigits(inst, inst._periods[S], 1),
                snn: this._minDigits(inst, inst._periods[S], 2),
                snnn: this._minDigits(inst, inst._periods[S], 3),
                s1: digit(inst._periods[S], 1),
                s10: digit(inst._periods[S], 10),
                s100: digit(inst._periods[S], 100),
                s1000: digit(inst._periods[S], 1000)
            };
            var html = layout;
            // Replace period containers: {p<}...{p>}
            for (var i = Y; i <= S; i++) {
                var period = 'yowdhms'.charAt(i);
                var re = new RegExp('\\{' + period + '<\\}([\\s\\S]*)\\{' + period + '>\\}', 'g');
                html = html.replace(re, ((!significant && show[i]) ||
                    (significant && showSignificant[i]) ? '$1' : ''));
            }
            // Replace period values: {pn}
            $.each(subs, function(n, v) {
                var re = new RegExp('\\{' + n + '\\}', 'g');
                html = html.replace(re, v);
            });
            return html;
        },

        /** Ensure a numeric value has at least n digits for display.
        	@private
        	@param inst {object} The current settings for this instance.
        	@param value {number} The value to display.
        	@param len {number} The minimum length.
        	@return {string} The display text. */
        _minDigits: function(inst, value, len) {
            value = '' + value;
            if (value.length >= len) {
                return this._translateDigits(inst, value);
            }
            value = '0000000000' + value;
            return this._translateDigits(inst, value.substr(value.length - len));
        },

        /** Translate digits into other representations.
        	@private
        	@param inst {object} The current settings for this instance.
        	@param value {string} The text to translate.
        	@return {string} The translated text. */
        _translateDigits: function(inst, value) {
            return ('' + value).replace(/[0-9]/g, function(digit) {
                return inst.options.digits[digit];
            });
        },

        /** Translate the format into flags for each period.
        	@private
        	@param inst {object} The current settings for this instance.
        	@return {string[]} Flags indicating which periods are requested (?) or
        			required (!) by year, month, week, day, hour, minute, second. */
        _determineShow: function(inst) {
            var format = inst.options.format;
            var show = [];
            show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));
            show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));
            show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));
            show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));
            show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));
            show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));
            show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));
            return show;
        },

        /** Calculate the requested periods between now and the target time.
        	@private
        	@param inst {object} The current settings for this instance.
        	@param show {string[]} Flags indicating which periods are requested/required.
        	@param significant {number} The number of periods with values to show, zero for all.
        	@param now {Date} The current date and time.
        	@return {number[]} The current time periods (always positive)
        			by year, month, week, day, hour, minute, second. */
        _calculatePeriods: function(inst, show, significant, now) {
            // Find endpoints
            inst._now = now;
            inst._now.setMilliseconds(0);
            var until = new Date(inst._now.getTime());
            if (inst._since) {
                if (now.getTime() < inst._since.getTime()) {
                    inst._now = now = until;
                } else {
                    now = inst._since;
                }
            } else {
                until.setTime(inst._until.getTime());
                if (now.getTime() > inst._until.getTime()) {
                    inst._now = now = until;
                }
            }
            // Calculate differences by period
            var periods = [0, 0, 0, 0, 0, 0, 0];
            if (show[Y] || show[O]) {
                // Treat end of months as the same
                var lastNow = this._getDaysInMonth(now.getFullYear(), now.getMonth());
                var lastUntil = this._getDaysInMonth(until.getFullYear(), until.getMonth());
                var sameDay = (until.getDate() == now.getDate() ||
                    (until.getDate() >= Math.min(lastNow, lastUntil) &&
                        now.getDate() >= Math.min(lastNow, lastUntil)));
                var getSecs = function(date) {
                    return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();
                };
                var months = Math.max(0,
                    (until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +
                    ((until.getDate() < now.getDate() && !sameDay) ||
                        (sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));
                periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);
                periods[O] = (show[O] ? months - periods[Y] * 12 : 0);
                // Adjust for months difference and end of month if necessary
                now = new Date(now.getTime());
                var wasLastDay = (now.getDate() == lastNow);
                var lastDay = this._getDaysInMonth(now.getFullYear() + periods[Y],
                    now.getMonth() + periods[O]);
                if (now.getDate() > lastDay) {
                    now.setDate(lastDay);
                }
                now.setFullYear(now.getFullYear() + periods[Y]);
                now.setMonth(now.getMonth() + periods[O]);
                if (wasLastDay) {
                    now.setDate(lastDay);
                }
            }
            var diff = Math.floor((until.getTime() - now.getTime()) / 1000);
            var extractPeriod = function(period, numSecs) {
                periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);
                diff -= periods[period] * numSecs;
            };
            extractPeriod(W, 604800);
            extractPeriod(D, 86400);
            extractPeriod(H, 3600);
            extractPeriod(M, 60);
            extractPeriod(S, 1);
            if (diff > 0 && !inst._since) { // Round up if left overs
                var multiplier = [1, 12, 4.3482, 7, 24, 60, 60];
                var lastShown = S;
                var max = 1;
                for (var period = S; period >= Y; period--) {
                    if (show[period]) {
                        if (periods[lastShown] >= max) {
                            periods[lastShown] = 0;
                            diff = 1;
                        }
                        if (diff > 0) {
                            periods[period]++;
                            diff = 0;
                            lastShown = period;
                            max = 1;
                        }
                    }
                    max *= multiplier[period];
                }
            }
            if (significant) { // Zero out insignificant periods
                for (var period = Y; period <= S; period++) {
                    if (significant && periods[period]) {
                        significant--;
                    } else if (!significant) {
                        periods[period] = 0;
                    }
                }
            }
            return periods;
        }
    });

})(jQuery);